The power would be nice, but I don't know how the cars would be to drive though. The two stage intercooler would increase the turbo lag quite a lot so the throttle response would be pretty bad.
From what I've heard they seem to last surprisingly well. The only problems I've heard about are headgaskets and turbochargers. A number of people (and tuning companies) say that 1.2 bar is a safe maximum boost to go for, so that's what I'll be aiming for with my car when I get my air leak into the fuel sorted out.
Shaun